Comic Title: Uncanny X-Men #256
Publisher: Marvel
Cover Date: Late December 1989
On Sale Date: October 3, 1989 Shipping Date October 3, 1989
Source: Marvel Age, #82

Shipping Date October 3, 1989
Source: Previews, #8

Shipping Date October 3, 1989
Source: Amazing Heroes, #172

Shipping Date October 5, 1989
Source: Advance Comics, #10

Newsstand Date October 24, 1989
Source: Marvel Age, #82

Direct Market Date October 5, 1989
Source: Comic Shop News, #119

Copyright Date October 3, 1989
Source: Library of Congress, Copyright Office 1989

Cover Price: $1.00
Page Count: 32
Editor: Bob Harras

Title: "The Key That Breaks the Locke"
Pages: 23

Feature(s):
X-Men

Writer: Christopher S. Claremont
Penciller: Jim Lee
Inker: Scott Williams
Letterer: Tom Orzechowski
Colorist: Glynis Wein (Oliver)

Reprinted In:
X-Men:Mutations TPB (1996)
X-Men Visionaries:Jim Lee TPB (2002)
Essential X-Men Vol. 9 TPB (2009)
Acts of Vengeance Crossovers Omnibus HC (2011)
Acts of Vengeance Crossovers Omnibus HC [Variant] (2011)
X-Men Epic Collection:Dissolution & Rebirth TPB (2019)
Acts of Vengeance:Spider-Man and the X-Men TPB (2021)